Display driving device, display driving method, display module and display device

Abstract

A display driving device, a display driving method, a display module and a display device are provided. The display driving device includes: a PWM signal generating circuit configured to generate a PWM signal; a PWM signal acquisition circuit, configured to identify whether the PWM signal output by the PWM signal generating circuit is at a high level or a low level; a gamma voltage debugging circuit, configured to debug a gamma voltage to obtain a first group of gamma voltage reference data corresponding to the PWM signal at the high level and a second group of gamma voltage reference data corresponding to the PWM signal at the low level in each gray-scale image; and a gamma voltage switching circuit.

The invention claimed is: 
     
       1. A display driving device, comprising:
 a Pulse Width Modulation (PWM) signal generating circuit configured to generate a PWM signal; 
 a PWM signal acquisition circuit, connected to a PWM signal generating circuit, and configured to identify whether a PWM signal output by the PWM signal generating circuit is at a high level or a low level; 
 a gamma voltage debugging circuit, configured to debug a gamma voltage to obtain a first group of gamma voltage reference data corresponding to the PWM signal at the high level and a second group of gamma voltage reference data corresponding to the PWM signal at the low level in each gray-scale image in a case that an actual voltage value of a pixel voltage corresponding to the PWM signal at the high level is the same with an actual voltage value of the pixel voltage corresponding to the PWM signal at the low level; and 
 a gamma voltage switching circuit, connected to the PWM signal acquisition circuit, the PWM signal generating circuit and the gamma voltage debugging circuit, and configured to store the first group of gamma voltage reference data and the second group of gamma voltage reference data, output the first group of gamma voltage reference data to a source driver in a case that the PWM signal acquisition circuit determines that the PWM signal is at the high level, and output the second group of gamma voltage reference data to the source driver in a case that the PWM signal acquisition circuit determines that the PWM signal is at the low level. 
 
     
     
       2. The display driving device according to  claim 1 , wherein the gamma voltage debugging circuit comprises:
 a determining sub-circuit, configured to determine: a first group of gamma voltage data corresponding to different gray-scale images in the case that the PWM signal is at the high level; 
 a debugging sub-circuit, configured to debug gamma voltages in different gray-scale images in the case that the PWM signal is at the low level, to obtain gamma voltage data in a case that the actual voltage value of the pixel voltage is the same with the actual voltage value of the pixel voltage corresponding to the PWM signal at the high level, and takes the gamma voltage data as the second group of gamma voltage data. 
 
     
     
       3. The display driving device according to  claim 2 , wherein the determining sub-circuit comprises:
 a first determining sub-circuit, configured to determine transmittances corresponding to the different gray-scale images; 
 a second determining sub-circuit, configured to determine the gamma voltages corresponding to the different gray-scale images; and 
 a third determining sub-circuit, configured to determine the gamma voltages corresponding to the transmittances in the different gray-scale images to obtain the first group of gamma voltage data. 
 
     
     
       4. The display driving device according to  claim 3 , wherein the debugging sub-circuit is configured to:
 determine gamma reference data in the different gray-scale images in a case that the first group of gamma voltage reference data corresponds to the high level of the PWM signal; 
 debug the gamma voltage corresponding to the PWM signal at the low level in a corresponding gray-scale until image brightness of all gray-scale images are the same with an image brightness in the gray-scale image corresponding to the PWM signal at the high level, to obtain the second group of gamma voltage reference data. 
 
     
     
       5. A display module comprising the display driving device according to  claim 1 . 
     
     
       6. A display device comprising the display module according to  claim 5 . 
     
     
       7. A display driving method, comprising:
 debugging a gamma voltage to obtain a first group of gamma voltage reference data corresponding to the PWM signal at the high level and a second group of gamma voltage reference data corresponding to the PWM signal at the low level in each gray-scale image in a case that an actual voltage value of a pixel voltage corresponding to the PWM signal at the high level is the same with an actual voltage value of the pixel voltage corresponding to the PWM signal at the low level; 
 storing the first group of gamma voltage reference data and the second group of gamma voltage reference data; 
 identifying whether the PWM signal output by the PWM signal generating circuit is at a high level or a low level; and 
 outputting the first group of gamma voltage reference data to a source driver in a case that the PWM signal acquisition circuit determines that the PWM signal is at the high level, and outputting the second group of gamma voltage reference data to the source driver in a case that the PWM signal acquisition circuit determines that the PWM signal is at the low level. 
 
     
     
       8. The display driving method according to  claim 7 , wherein the debugging the gamma voltage to obtain the first group of gamma voltage reference data corresponding to the PWM signal at the high level and the second group of gamma voltage reference data corresponding to the PWM signal at the low level in each gray-scale image in the case that the actual voltage value of the pixel voltage corresponding to the PWM signal at the high level is the same with the actual voltage value of the pixel voltage corresponding to the PWM signal at the low level further comprises:
 determining a first group of gamma voltage data corresponding to different gray-scale images in the case that the PWM signal is at the high level; 
 debugging the gamma voltages in different gray-scale images in the case that the PWM signal is at the low level, to obtain gamma voltage data in a case that the actual voltage value of the pixel voltage is the same with the actual voltage value of the pixel voltage corresponding to the PWM signal at the high level, and taking the gamma voltage data as the second group of gamma voltage data. 
 
     
     
       9. The display driving method according to  claim 8 , wherein the determining the first group of gamma voltage data corresponding to the different gray-scale images in the case that the PWM signal is at the high level further comprises:
 determining transmittances corresponding to the different gray-scale images; 
 determining the gamma voltages corresponding to the different gray-scale images; and 
 determining the gamma voltages corresponding to the transmittances in the different gray-scale images to obtain the first group of gamma voltage data. 
 
     
     
       10. The display driving method according to  claim 7 , wherein the debugging the gamma voltages in the different gray-scale images in the case that the PWM signal is at the low level, to obtain gamma voltage data in the case that the actual voltage value of the pixel voltage is the same with the actual voltage value of the pixel voltage corresponding to the PWM signal at the high level and taking the gamma voltage data as the second group of gamma voltage data further comprises:
 determining the gamma reference data in the different gray-scale images in the case that the first group of gamma voltage reference data corresponds to the high level of the PWM signal; 
 debugging the gamma voltage corresponding to the PWM signal at the low level in the corresponding gray-scale until image brightness of all gray-scale images are the same with an image brightness in the gray-scale image corresponding to the PWM signal at the high level, to obtain the second group of gamma voltage reference data.